#!/usr/bin/env ruby

# $Id$
#
# Copyright (c) 2006 Seggy Umboh
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

# Searches for duplicate files in two trees
# and symlinks them to save space.

require 'fileutils'
require 'pathname'

unless ARGV.size == 1
  puts "Usage: #{$0} <source>"
  exit
end

source = Pathname.new(ARGV[0])
source = source.relative_path_from(Pathname.pwd) if source.absolute?
Pathname.new('.').find do |path|
  next unless path.file? and (source+path).file?
  relative_source = source.relative_path_from(path.dirname)
  if FileUtils.compare_file(path, source+path)
    FileUtils.rm(path)
    path.make_symlink(relative_source+path)
  end
end